Ok I connected the boost side of the turbo to the wastegate actuator and all this did was make it really slow, the boost guage on the dashboard screen only showed a few bars of boost also, is this normal?

Yep...normal to be slow....and actual good news....it means that the wastegate is doing it's job. It's working.


Investigate the wastegate solenoid, it's wires and lines.

The the problem is there.

The ECU is comanding the wastegate open...but the signal doesn't get performed....it then closes the throttle pate to save the engine.

That’s good to know, so there shouldn’t be any issues long term provided I sort out the solenoid? Is the wastegate solenoid the part that MES refers to as the turbo actuator in the graph?

aurick86 said:

Really?
Haven't you been reading what i've been writing?
GET MES ON IT!!

Make graphs, check values.. check what's going on... as i always say DON'T REPLACE PARTS then complain that it's not working.
Those parts aren't just thrown in to the engine bay.. they have wires, connectors, hoses.. have you checked those?

Click to expand...

THe full set of ECU scan kit cost me £126 and I have had value back many times over so I agree with Aurick 86 get a proper scan or you are going to end up replacing all sorts of things that may be OK!!

Yes, turbo actuator and wastegate solenoid....same thing.
No long term problems.

The problem area is narrowed down....you just need to fivure out what the issue is, is it the wiring, the solenoid or the vacuum/boost lines.

In the full MES you can trigger the solenoid from the actuator tab. With the engine off, you could hear the solenoid....or do the blow through test(see where the air goes when activated).

The Panda Nut said:

THe full set of ECU scan kit cost me £126 and I have had value back many times over so I agree with Aurick 86 get a proper scan or you are going to end up replacing all sorts of things that may be OK!!

Click to expand...

Yeah I came to my senses and ordered a vagcom 409 for £21 from Amazon, plus the £50 for a registered version of MES on my mrs laptop and after running a few tests it became clear what the issue was, much better than guessing and spending money replacing parts unnecessaraly as I had done. It’s the first turbo car I have owned and have learned a lesson in how to go about dealing with problems that crop up with a turbocharged car.

aurick86 I tried triggering the actuator in MES and it wouldn’t work, engine off, a warning window came up saying it couldn’t execute. Does this mean the solenoid is done?

I fitted new vacuum hoses to all three outlets and the two wires running into the plug are in good condition. I do have a solenoid arriving tomorrow I ordered two weeks ago from Germany (another part of ordered aimlessly) so hopefully I can bring this thread to a close with some good news tomorrow.

I'm not sure the free version of MES can run tests.
I think the 50 version is valid for only one machine.... be careful where you activate it.

The tests won't start until all conditions are met... unfortunately it doesn't always say what the conditions are... in this case it might need the engine running... or even load/boost on the engine.

You can always try the manual way of testing i mentioned a while back:
"use a 9v battery, connect it to the 2 contacts while blowing through the line (the one that has pressure on it from the turbo)... when connected it should click and change the direction of air in the from the turbo intake to the wastegate...(or the other way around)"

aurick86 Well the new solenoid came today, fitted it and connected back up as it should, took it a drive and it’s still making the whooshing noise with no power. I will need to double check my connections and wiring but it’s a bit more frustrating now as I’d thought it would be sorted with that new part :/

1.You need to check the wiring NOT JUST visually.
Get out the multimeter, power probe ...etc... the best thing for this would be an oscilloscope.
I can't tell you where the wires go, but i think Bernievarian can. (talking about the wires that go from ECU to wastegate/ boost solenoid on a Bravo t-jet)

It's probably a constant 5v or 12v that is being grounded by the ECU based on need (similar to a PWM signal).

2.Check the new solenoid 9v battery test.

3. Was this car remapped??

aurick86 I came home from work and decided to run another test with MES to see the results and correct me if I'm wrong but it does appear as though there is no more overboost and as such the throttle isn't being closed off by the ecu anymore?



Am I right in thinking that my car is running as it should again? I've been driving with the overboost issue for three weeks now so I've gotten used to it but it feels like things are back to normal after all :shrug:

That looks good.
Throttle staying opened as long as the accelerator is pressed, boost is controlled, not going over 2000mbar (2bar=1 atmospheric +1bar boost).


Fiy:
-you were hiting "boost cut".
-"overboost" is something else. In this case it's programed into the ECU, it gives you a bit more torque for a few seconds.
-you can see the overboost hump on the graph.



If you still get the whooosh sound, it might be a boost leak....no way around this....you need a
To make a boost leak tester(youtube mcm or jafromobile have some nice videos about this), a smoke machine might not be enough.

Ok I’ve got you now, might try the test again with sport mode on and compare.

I should add that I’ve installed a gsr induction kit at the same time, the noise seems to be originating from this area plus the whooshing is only there on partial throttle/ low rpm. Are induction kits known to make these sorts of noises? There’s a rather big cone filter on the end of it.

Yes it is known.

The stock airbox is very good and the filter is enormous. I wouldn't change it.
You might be interested in this:

The noise you're hearing is probably a combination of the bypass valve and the turbo itself.

hi guys, im new to the forum.

ive had my EGR cleaned but the guy recommended i replace the EGR so i have ordered a new one.

the car lags every time i shift gears, turbo kicks in after 1500 or so.

i have notice a leak near the turbo pipe and looks fresh, also notice another pipe corroding.

any suggestion to what the pipes are called or how to tackle the problem???

Hi! I just want to confirm situation with boost cut. I had the same problem with my T-jet. Car was producing woooosshh nosie when throttle was fully pressed. Acceleration was poor after woooshh noise. I was thinking that some clamp is loose or something, but it wasnt. After running MES i saw that throttle is closing after boost rises to high. I have changed three way waste gate actuator and problems were solved!
Here is the graph:
http://uploadslika.eu/image/gmXas



I would like to put some tags for people with same problems, because i spend a lot amount of time to find this thread
Tags: boost cut, boost problems, wastegate, waste gate, differential valve, T-jet, tjet, 1.4 T-Jet, turbo noise, pressure converter, 46813571, bad acceleration, poor performace

Hello! I have just thinking to post a new thread, but find this one. I am a fresh owner of Bravo 198 1.4 T-Jet 120 hp, and i have similar problem with my car. I would be very thankful if aurick86 or someone else can check my MES graphs from today. There is no strange noises or whistling form engine bay, maybe only quiet noise from oil segregator. I have not trying anything yet like cleaning or bypassing parts.
Thanks!



P.S. Forgot to check something. The seller tells me that the turbocharger was been changed (don't know for sure is it true), and now my turbo is stamped with TurboRail sign at the cold part. What should have to be the original turbocharger?

Turborail is a good chinese turbo. I had one for 35k km and made over 190hp.

Think the problem you have is the install. More specifically the wastegate solenoid. Post a few pictures of it, so i can figure out where the hoses are connected.

Thanks for fast response!
Here are some pics from solenoid.

That is connected right. I have clamp on intake pipe/turbo connection on my GP T-jet, i cant see it at yours. Put a clamp on hose if you dont have it on... Also I red in one thread that broken oil separator may create boost problems, try to find it if you said that some noise is coming from your oil separator...

Deyan86 said:

Hello! I have just thinking to post a new thread, but find this one. I am a fresh owner of Bravo 198 1.4 T-Jet 120 hp, and i have similar problem with my car. I would be very thankful if aurick86 or someone else can check my MES graphs from today. There is no strange noises or whistling form engine bay, maybe only quiet noise from oil segregator. I have not trying anything yet like cleaning or bypassing parts.
Thanks!



P.S. Forgot to check something. The seller tells me that the turbocharger was been changed (don't know for sure is it true), and now my turbo is stamped with TurboRail sign at the cold part. What should have to be the original turbocharger?

Click to expand...

The solenoid is connected correctly.
(the solenoid can still be broken internally, mechanically ...so no error)

Is the wastegate closed? can you move it by hand? make sure it's not hanging up on something.

How did you make those graphs?
(they need to be done in 3rd gear with car in motion) Turbos need load to make boost.

The oil segragator can leak boost... but can easily be tested by blocking off the hose going from segragator to intake manifold.